The problem is that as soon as I add data-bs-toggle="dropdown" to my dropdown trigger element, the dropdown works without using javascript (ie: adding the data-bs-toggle="dropdown" attribute is ...

In Bootstrap 5 prior 5.3 there is an issue that the css variables for breakpoints are missing, which was fixed (by me) with version 5.3. Up to version 5.3, you can use the bootstrap-detect-breakpoint ...