As someone reported (on DeWP technical workshop, TWS) the thanks button is missing on imported versions but curiously not in the mobile version (or per special page: https://de.wikipedia.org/wiki/Special:Thanks/173093813):
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Event Timeline
Restricted Application added a project: Collaboration-Team-Triage. · View Herald TranscriptFeb 11 2018, 11:32 PM2018-02-11 23:32:22 (UTC+0)
Perhelion renamed this task from Thanks button is absent (desktop diff-view) to Thanks button is missing (desktop diff-view).Feb 11 2018, 11:46 PM2018-02-11 23:46:51 (UTC+0)
Perhelion renamed this task from Thanks button is missing (desktop diff-view) to Thanks button is missing (only desktop diff-view).Feb 12 2018, 1:18 AM2018-02-12 01:18:55 (UTC+0)
Trizek-WMF renamed this task from Thanks button is missing (only desktop diff-view) to Thanks button is missing (only desktop diff-view) on imported versions.Mar 6 2018, 6:56 PM2018-03-06 18:56:02 (UTC+0)
Catrope closed this task as a duplicate of T186470: Some edits cannot be thanked in page histories with imported revisions.Mar 6 2018, 7:15 PM2018-03-06 19:15:58 (UTC+0)