Inconsistent $ref codegen

[jods4]

Version

3.2.6

Reproduction link

https://sfc.vuejs.org/#eyJBcHAudnVlIjoiPHNjcmlwdCBzZXR1cCBsYW5nPVwidHNcIj5cbmltcG9ydCB7IHJlZiB9IGZyb20gJ3Z1ZSdcblxubGV0IG1zZyA9ICRyZWY8c3RyaW5nIHwgbnVtYmVyPignSGVsbG8gV29ybGQhJyk7XG5tc2cgPSA0Mjtcbjwvc2NyaXB0PlxuXG48dGVtcGxhdGU+XG4gIDxoMT57eyBtc2cgfX08L2gxPlxuICA8aW5wdXQgdi1tb2RlbD1cIm1zZ1wiPlxuPC90ZW1wbGF0ZT4ifQ==

Steps to reproduce

This repro tries to use a generically typed $ref<string | number>:
https://sfc.vuejs.org/#eyJBcHAudnVlIjoiPHNjcmlwdCBzZXR1cCBsYW5nPVwidHNcIj5cbmltcG9ydCB7IHJlZiB9IGZyb20gJ3Z1ZSdcblxubGV0IG1zZyA9ICRyZWY8c3RyaW5nIHwgbnVtYmVyPignSGVsbG8gV29ybGQhJyk7XG5tc2cgPSA0Mjtcbjwvc2NyaXB0PlxuXG48dGVtcGxhdGU+XG4gIDxoMT57eyBtc2cgfX08L2gxPlxuICA8aW5wdXQgdi1tb2RlbD1cIm1zZ1wiPlxuPC90ZW1wbGF0ZT4ifQ==

It doesn't work and if you look at the JS code, $ref was passed through without modification.

Strangely, if I add a second simple $ref, such as in this example:
https://sfc.vuejs.org/#eyJBcHAudnVlIjoiPHNjcmlwdCBzZXR1cCBsYW5nPVwidHNcIj5cbmltcG9ydCB7IHJlZiB9IGZyb20gJ3Z1ZSdcblxubGV0IHggPSAkcmVmKDEpO1xubGV0IG1zZyA9ICRyZWY8c3RyaW5nIHwgbnVtYmVyPignSGVsbG8gV29ybGQhJyk7XG5tc2cgPSA0Mjtcbjwvc2NyaXB0PlxuXG48dGVtcGxhdGU+XG4gIDxoMT57eyBtc2cgfX08L2gxPlxuICA8aW5wdXQgdi1tb2RlbD1cIm1zZ1wiPlxuPC90ZW1wbGF0ZT4ifQ==

Now they're both correctly transformed??

What is expected?

First repro should work as well

What is actually happening?

$ref<string> isn't transformed when there's no other $ref.