Some models don't support context shift?

[git2212]

It is my understanding that context shift is enabled by default... I've noticed that some models don't appear to support context shift and come to a dead stop (no more response generation) when the context length is reached while others will entertain longer contexts happily.

Is there some parameter I could be missing or is this a know limitation of some models?

[mashdragon]

Recently disabled with #15416, use --context-shift to bring it back. Reason given is that it causes issues with modern models which rely much more on templates.

[Iris-Colt-IF]

--context-shift doesn't seem to work with Qwen 3 VL...

Inference hits a hard stop ("request (x tokens) exceeds the available context size (y tokens), try increasing it") [where x > y]

[maddes8cht]

Same here:
--context-shift doesn't work.
Looks like #17284