I have exactly the same problem in v 0.41.5 and 0.41.4
Here is the content of the resulting file:
{"database_id":2,"started_at":"2022-01-19T16:14:59.866785Z","via":[{"status":"failed","class":"class clojure.lang.ExceptionInfo","error":"Error al reducir las filas de resultados","stacktrace":["--> 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- user1_id"}]],"source-table":23,"condition":["=",["field",60,null],["field",179,{"join-alias":"users_user - user1_id"}]],"alias":"users_user - user1_id"},{"fields":[["field",175,{"join-alias":"users_user - user2_id"}],["field",165,{"join-alias":"users_user - user2_id"}]],"source-table":23,"condition":["=",["field",64,null],["field",179,{"join-alias":"users_user - user2_id"}]],"alias":"users_user - user2_id"},{"fields":[["field",219,{"join-alias":"chatmessages_chatmessage","temporal-unit":"default"}],["field",214,{"join-alias":"chatmessages_chatmessage"}],["field",215,{"join-alias":"chatmessages_chatmessage"}]],"source-table":26,"condition":["=",["field",59,null],["field",220,{"join-alias":"chatmessages_chatmessage"}]],"alias":"chatmessages_chatmessage"}],"fields":[["field",59,null]],"order-by":[["desc",["field",219,{"join-alias":"chatmessages_chatmessage"}]]],"filter":["=",["field",214,{"join-alias":"chatmessages_chatmessage"}],"unread"]},"database":2,"middleware":{"process-viz-settings?":true,"skip-results-metadata?":true,"format-rows?":false},"async?":true,"viz-settings":{"table.pivot":false,"metabase.shared.models.visualization-settings/table-columns":[{"metabase.shared.models.visualization-settings/table-column-name":"id","metabase.shared.models.visualization-settings/table-column-field-ref":["field",59,null],"metabase.shared.models.visualization-settings/table-column-enabled":true},{"metabase.shared.models.visualization-settings/table-column-name":"created","metabase.shared.models.visualization-settings/table-column-field-ref":["field",219,{"join-alias":"chatmessages_chatmessage","temporal-unit":"default"}],"metabase.shared.models.visualization-settings/table-column-enabled":true},{"metabase.shared.models.visualization-settings/table-column-name":"status","metabase.shared.models.visualization-settings/table-column-field-ref":["field",214,{"join-alias":"chatmessages_chatmessage"}],"metabase.shared.models.visualization-settings/table-column-enabled":true},{"metabase.shared.models.visualization-settings/table-column-name":"first_name","metabase.shared.models.visualization-settings/table-column-field-ref":["field",175,{"join-alias":"users_user - user1_id"}],"metabase.shared.models.visualization-settings/table-column-enabled":true},{"metabase.shared.models.visualization-settings/table-column-name":"first_name_2","metabase.shared.models.visualization-settings/table-column-field-ref":["field",175,{"join-alias":"users_user - user2_id"}],"metabase.shared.models.visualization-settings/table-column-enabled":true},{"metabase.shared.models.visualization-settings/table-column-name":"email","metabase.shared.models.visualization-settings/table-column-field-ref":["field",165,{"join-alias":"users_user - user2_id"}],"metabase.shared.models.visualization-settings/table-column-enabled":true},{"metabase.shared.models.visualization-settings/table-column-name":"message","metabase.shared.models.visualization-settings/table-column-field-ref":["field",215,{"join-alias":"chatmessages_chatmessage"}],"metabase.shared.models.visualization-settings/table-column-enabled":true}],"metabase.shared.models.visualization-settings/column-settings":{},"table.cell_column":"message","card.title":"Conversaciones","table.column_formatting":[],"card.description":null,"table.pivot_column":"status"}},"native":{"query":"SELECT "public"."conversations_conversation"."id" AS "id", "users_user - user1_id"."first_name" AS "users_user - user1_id__first_name", "users_user - user2_id"."first_name" AS "users_user - user2_id__first_name", "users_user - user2_id"."email" AS "users_user - user2_id__email", "chatmessages_chatmessage"."created" AS "chatmessages_chatmessage__created", "chatmessages_chatmessage"."status" AS "chatmessages_chatmessage__status", "chatmessages_chatmessage"."message" AS "chatmessages_chatmessage__message" FROM "public"."conversations_conversation" LEFT JOIN "public"."users_user" "users_user - user1_id" ON "public"."conversations_conversation"."user1_id" = "users_user - user1_id"."id" LEFT JOIN "public"."users_user" "users_user - user2_id" ON "public"."conversations_conversation"."user2_id" = "users_user - user2_id"."id" LEFT JOIN "public"."chatmessages_chatmessage" "chatmessages_chatmessage" ON "public"."conversations_conversation"."id" = "chatmessages_chatmessage"."conversation_id" WHERE "chatmessages_chatmessage"."status" = ? ORDER BY "chatmessages_chatmessage"."created" DESC LIMIT 1048575","params":["unread"]},"status":"failed","class":"class java.lang.IllegalArgumentException","stacktrace":["org.apache.poi.ss.usermodel.CellBase.checkLength(CellBase.java:293)","org.apache.poi.ss.usermodel.CellBase.setCellValue(CellBase.java:274)","--> 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maximum length of cell contents (text) is 32767 characters","row_count":0,"running_time":0,"preprocessed":{"type":"query","query":{"source-table":8,"fields":[["field",59,null],["field",175,{"join-alias":"users_user - user1_id"}],["field",175,{"join-alias":"users_user - user2_id"}],["field",165,{"join-alias":"users_user - 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