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Hi,
We have found a bug, that for the grid with enabled both frozen rows and columns, when remote data source is used, sometimes top-left corner of grid is rendered as empty.
Issue can be recreated here:
https://stackblitz.com/edit/qqxb5x?file=index.ts
Just open the example, wait 5sec (for the timeout to be executed) and observe cells frozen by both columns and rows:

In our internal use cases it is reproduced in different scenarios, but for demo it was simplest to recreate just by refreshing grid from example code.