Descriptive Problem Summary:

Appearances randomly use different ones. Unfortunately can't find a clear way to reproduce this but starting this thread in hopes someone will have some ideas.
In few previous cases only specific directions (ie south sprite for few objects) were replaced but it turned out to not be always the case.

https://streamable.com/4u5ydz

Vent sprites randomly replaced with rubber duck. Notably these vents do not have animates/flicks happening. It's standard single icon_state animation. This is not consistent, the glitches affect apparently anything including screen images. This corruption seems to sometimes get worse with time.

When does the problem NOT occur? Right after initial connection. Only happens after a moment of play/moving.

Did the problem NOT occur in any earlier versions? If so, what was the last version that worked? Not in 513, unsure about earlier 514 versions.

Workarounds: None that i know of.