Ask HN: Signing bonus situation sketchiness

Wanted to get some feedback from the hivemind:

Recently joined a company, compensation included a signing bonus 'provided I stay with the firm for 6 months'.

To me 'signing bonus' suggests a bonus you get at the time of signing, for signing.

After some weeks of not being very forthcoming about when I can expect my bonus, they are now telling me that I will get it at 6 months.

To me this feels quite sketchy and at best very misleading. That was not my expectation when signing.

What do you think?