perfcollect pid filter produces empty dump in PerfView

# perfcollect collect sample-pid-threadtime -collectsec 10 -threadtime -pid 1
Collection started. Collection will automatically stop in 10 second(s). Press CTRL+C to stop early.

...STOPPED.

Starting post-processing. This may take some time.

Warning:
Processed 2682678 events and lost 89 chunks!

Check IO/CPU overload!

Generating native image symbol files
...FINISHED
Saving native symbols
Warning:
Processed 2682678 events and lost 89 chunks!

Check IO/CPU overload!

...FINISHED
Resolving JIT and R2R symbols
...FINISHED
Exporting perf.data file
...FINISHED
Compressing trace files
...FINISHED
Cleaning up artifacts
...FINISHED

Trace saved to sample-pid-threadtime.trace.zip

This produced a 173 MB zip file, but opening up in PerfView only shows the CPU Stack option with no content (only ROOT entry in By Name)

Ubuntu 18.04.6
perf version 4.15.18
lttng (LTTng Trace Control) 2.10.2 - KeKriek
dotnet 6.0.201
PerfView 3.03

Reproduce the perfcollect collect sample-pid-threadtime -collectsec 10 -threadtime -pid 1 command on Ubuntu 18.04.6, then open the resulting trace ZIP in PerfView 3.03 and inspect the CPU Stack view. Done means the filtered trace displays usable stack content instead of only the ROOT entry.