Regression in [0] which missed excluding FRAME_CHANGE from
deg_recalc_flags_for_legacy_zero causing all
DEG_id_tag_update(&scene->id, 0) calls to re-calculate animation data.
When this tagging was done in the RNA update function, changing
key-framed values in the UI would be immediate reset to their
keyed-values.
Thanks to Philipp Oeser for finding the root cause.
[0]: 35aedd87e7
328dfab423