A user can drag-expand a cell and have the data auto-fill, typically with an incremental value. Hidden/filtered cells are skipped in this process since LO 3.6 via commits in the range https://cgit.freedesktop.org/libreoffice/core/log/?id=7a64988dbc7a1542aa38f0e8f9a8a47941fbc67d&qt=range&q=ee7084c4f720c932df67c8ff033dab4d8d556179..250feedd8e50e5eb52682a194823567ba5287c60 However, the AutoFillPreview doesn't take into account the hidden columns, and so it displays the wrong value while the drag-selection is progressing. One commit in the range looks like it was started to be worked on, but apparently never finished or followed up on. https://cgit.freedesktop.org/libreoffice/core/commit/?id=73ff3a49a0891c7787f08eec86357c320a76c263 first part for ScTable::GetAutoFillPreview
Justin Luth committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/core/commit/9cd4da63b6ed19b71a2475fccb4ab135f0a87873 tdf#147404 sc AutoFillPreview: consider hidden cells It will be available in 7.4.0. The patch should be included in the daily builds available at https://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: https://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.