Angular View Engine and the Angular Compatibility Compiler have not been officially supported and marked as deprecated for a while (since Angular 12 I think - May 2021).
With the upcoming Angular v16 release (ETA 1-2 months, May 2023) the ngcc view engine compiler will be deprecated completely. This will make the Bryntum scheduler fully incompatible with new release.
I would be thankful if you could consider upgrading and creating a new release of the Bryntum Scheduler with an ivy distribution.
Source: https://github.com/angular/angular/blob/main/CHANGELOG.md#1600-next0-2023-02-22