Likely related to T374145
Found when T375834: Thanks styled as link on mobile (no role attribute)
Steps:
On mobile testwiki wmf.25 go to History and click to display any revision of an article, e.g. https://test.m.wikipedia.org/w/index.php?title=MavetunaZilant21&diff=614859&oldid=614858
What happened:
The Wikitext icon displayed incorrectly:
What should happen:
The wikitext button displayed as before, e.g. wmf.24 https://en.m.wikipedia.org/w/index.php?diff=1248533684&oldid=1247889834&title=Shoko_Ikeda
Notes:
- the issue is present only on mobile