SectionSetInstType doesn't take immediate effect

I am testing a condition in the .Init and setting a section to be included on certain install types if it is met. BUT the section is not included unless I choose another Install type and then revert back to the default Install Type.

Should not SectionSetInstType affect the current selection and not just future selections ??

I have attached a test script. I expected section "Test 1" to be included straight away.

I have worked around this so not critical.