Jumping in a two-block-high space causes the game to accuse you of standing on air

This console message seems especially prevalent lately and I’ve found a way to reliably reproduce it:

• make sure the game log is open

• walk into a two block high area

• jump

• observe

Expected results: nothing special in the game output

Actual results: every ten seconds, the game assumes you must have been anomalously standing on top of an air block

How to fix: whatever is causing the game to assume this, take a look at it and resolve it to reduce log spam