I tested it on latest master versions of Timeless, MF and core and on 1.34.
Steps to Reproduce:
You will need a page with multiple edits made on it. Then, on Special:RecentChanges in enhanced mode these changes should be grouped and an arrow should appear to expand it.
The bug occurs when using mobile mode with the Timeless skin.
Actual Results:
The arrows for expanding grouped RC items do not show up.
Expected Results:
The arrows should either appear normally, or RC items should not be grouped at all. The latter is what Minerva does.
I think the reason these arrows do not show up is that some RL module that provides them is not loaded. Maybe MF assumes these won't be needed as RC shouldn't be grouped, but it still is for some reason?