In 2022 the TPlannerCalendarGroup needs to display 6 (instead of 5) weeks in May and October. Otherwise days are missing ...
Is there anything I can configure to make them visible? Or does it need a fix in the TMS components?
I hope the image upload below worked to illustrate the issue ...
Thanks for reporting.
We fixed the issue. The next update will address this.
Thanks for the quick action! 
I have been playing around a little, and I think it might be related to the start of the week setting. But you surely found that ;-) ...
That pushes month of May to use 6 weeks yes.
We did a general fix that will be included in the next update.