When textangle is provided in a region description, Firefly does not draw the associated region. The afw.display.dot method allows specifying the textangle, but when this argument is provided, the region is not displayed.

Example of region text generated by afw.display.dot that does not display:

text 1074 110 "Text" # color=yellow textangle=45.0

The format we need to support for angle is textangle= after the hash symbol.