I have seen this in the past as well. My experience has been that if the symbol outline includes the entire symbol, it will not show up as a bordrer.
I have looked at the 2 symbols you provided and see that the mda-dsheet2 symbol has the symbol outline including the entire symbol.
The mda-sheet2 symbol has they symbol outline in the lower left corner of the symbol
Shrink the symbol outline for mda-sheet2 similar to mda-sheet3 and you should be ok.
One other item to note is that when you edit the symbol, make sure that the File > Preferences "Automatic outline update" option is not selected, otherwise it will cover the entire symbol again.
Hope that helps,
it may be that you are not using the correct library?
In top picture there are 10 symbols and in lower there are 14 symbols (without mda ...).
Please check the library! I hope it helps more!
The symbol-outline should not be the problem.
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Fixing the symbol outline as suggested by Rick appears to resolve this issue in my tests. Can you confirm this and if so mark the question as answered.
If you think training is expensive, you should try ignorance!
Thank you for this tip. This was the issue.
Excellent answer !
I think this should be highlighed in bold, underlined with a font size of 72 in the documentation.
It is covered in the Symbol Editor manual under 'Creating a Border Symbol'. In step 4 it emphasises the bounding box should be very small; and there is a note about the fact that if you have a bounding box at full-extent you will have problems selecting symbols on a sheet if you use the border symbol.
Anyway, I've logged a defect against the fact that it doesn't show up in the dialog in this case too, so documentation will be updated to reflect this fact.