The Test Modification button in Template Modifications triggers an overlay.
As overlays are cached by default, if you make any changes, these aren't reflected on subsequent presses of the Test Modification.
Adding:
to the button will resolve that issue.
As overlays are cached by default, if you make any changes, these aren't reflected on subsequent presses of the Test Modification.
Adding:
HTML:
data-cacheoverlay="false"
to the button will resolve that issue.