Is there a compatibility between updated versions for protected model in R2019b?

I created a protected model in R2019bU9 and I opened and ran it in R2019b and then I got the following error message.

One or more global variables used by protected model E:\TEST\TEST_IP_Model.slxp are incompatible with the variables that existed when the protected model was created. This protected model uses global variable(s): 'TEST_bus'.

Answer 1

[MathWorks Support Team]

We would expect protected models to work in the same release that they were created, independently of the update version. However, this is not true for some releases.

This behavior was indirectly introduced as a side-effect of the fix for Bug Report 2429203 (that is why it appears in all the updates/releases where Bug Report 2429203 was implemented). 

Models that are Protected in       Cannot be used in 

------------------------------------------------------------------------------

19b_update9 and later                19b_update8 and before

20a_update7 and later                20a_update6 and before

20b_update6 and later                20b_update5 and before

21a and 21a_update1                   21a_update2 to 21a_update7  

21a_update2 and later                 21a and 21a_update1   

Between updated versions in 19b, if you protects your model in 19b_update9, you will only be able to use it in 19b_update9. If you protect it in 19b_update8 and before, it can be used in 19b_update8 and before.