Failed to generate models. sometimes after deployment

[ewuski]

Describe the bug
We sometimes experience an error after deployment on remote environment.

There is no clear explanation what happens. The log only says the following:

Failed to generate models.
Umbraco.Cms.Infrastructure.ModelsBuilder.AutoModelsNotificationHandler
800001ee-0002-5f00-b63f-84710c7967bb
/umbraco/backoffice/umbracoapi/authentication/PostLogin
11608
w3wp
32
e11d0c86b1a565a7bfeb26f86d7f0d905c37ec57
WIN-M6SHD2S0HP3
ERROR
7fefae18-9366-44f0-b989-e13a3c114ed0
1
0

To Reproduce
Steps to reproduce the behavior:
Not sure what steps are necessary for it to happen.
We normally updated our models on local and dploy via Azure pipelines to staging or UAT.
The remote site has the import set to happen on startup:

"ImportAtStartup": "Settings",

When the error triggers we try to import manually via uSync section, clicking Import. At this time the import seems to get stuck and not progressing - see the picture attached.

Expected behavior
It should not throw the error.
It should import the models and updated the doc types etc. on startup and manually.

Screenshots

About your Site (please complete the following information):

• Umbraco Version: 10.4.0
• uSync Version: 10.0.0
• Browser [e.g. chrome, safari] Chrome

Additional context