Right now cursor reposition is disabled for layered cursors. See discussion here.

Consider implementing cursor repositioning once layered cursors are redesigned.

Update:
Cursor repositioning is a mechanism that periodically releases the BTree page a cursor pins, then re-finds the same key by searching from the root. Initially, it was developed on MongoDB's request. See WT-8707 .
Eventually, cursor repositioning was never used by MongoDB and currently is OFF by default in WiredTiger.

Implementing cursor repositioning for layered tables has been never required by MongoDB.