Not exactly sure when this started, but oversighters cannot see suppressed edits upon clicking the "suppressed user contributions" link. It seems from some minimal testing that recent suppressions appear, but older ones do not; I'm not sure where the cutoff is. As an example, I suppressed a single edit in my sandbox just now, but while that appears none of my previous suppressed edits appear; see https://en.wikipedia.org/w/index.php?title=Special:Log/suppress&offender=Amorymeltzer
Alternatively, compare https://en.wikipedia.org/wiki/Special:Log?type=suppress&offender=188.8.131.52 (old, doesn't not working) with https://en.wikipedia.org/w/index.php?title=Special:Log/suppress&offender=184.108.40.206 (new, working).
It seems the error has to do with the offender parameter. For an example, searching via target works fine https://en.wikipedia.org/wiki/Special:Log?type=suppresspage=User%3AAmorymeltzer but searching revision author with the user who made those edits fails https://en.wikipedia.org/w/index.php?title=Special:Log/suppress&offender=220.127.116.11 Potentially relatedly, the OOUI inputWidget for Revision Author (i.e. the offender parameter) dropdown (div#mw-input-offender) does not autofill like the other menus.