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gst-launch-1.0 -vf filesrc location=h264/alphaconformanceG.264 ! h264parse ! fakesink

ERROR:../gst/videoparsers/gsth264parse.c:1315:gst_h264_parse_handle_frame: assertion failed: (current_off < size)

Since !422 (merged), commit e906197c :

commit e906197c622725e48b6250a71a922d45b006fb14
Author: Jan Schmidt <jan@centricular.com>
Date:   Wed Apr 1 02:36:40 2020 +1100

    baseparse: Fix upstream read caching
    
    When running in pull mode (for e.g. mp3 reading),
    baseparse currently reads 64KB from upstream, then mp3parse
    consumes typically around 417/418 bytes of it. Then
    on the next loop, it will read a full fresh 64KB again,
    which is a big waste.
    
    Fix the read loop to use the available cache buffer first
    before going for more data, until the cache drops to < 1KB.
    
    Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/issues/518

Reverting this commit fixes the regression.

Also seeing similar error with some h265parse use-cases.