[Bug] Splitlines not appear when boundaryGap is set to false

[amaurylivier]

Version

5.5.1

Link to Minimal Reproduction

https://codepen.io/BokehJS/pen/BagbGWV

Steps to Reproduce

I put the boundaryGap to false in a polar plot then the splitlines disappear between last and first category.

Current Behavior

I put the boundaryGap to false in a polar plot then the splitlines disappear between last and first category.

Expected Behavior

The splitline should continue between the last and first category.

Environment

- OS:Windows 11
- Browser: Microsoft Edge
- Framework:

Any additional comments?

No response

[Ovilia]

Fixed in #20184 . @plainheart Could you help review it when you have time?