safari14 version issue

hi, I am a UI developer who really wants to apply polyfill to the service. 😀
I confirmed that it applies well up to version 15, but it is a problem in version 14.
In Safari14 version, the data-cqc-* attribute is not created, so the style of :where([cqc~**]) does not seem to be matched and applied properly.
It appears that all declared `@container` styles are displayed.
Is this working properly? Please confirm.

https://codepen.io/chriscoyier/full/yLzKavz

safari 15

safari 14

Start by reproducing the linked CodePen in Safari 14 and Safari 15, comparing creation of the data-cqc-* attribute and application of the :where([cqc~**]) styles. Trace the polyfill entry point responsible for @container styles and determine whether Safari 14 should receive the same behavior; done means the discrepancy is explained and, if confirmed as a bug, covered by a regression check.

Written by the indexing model from the issue text.