Why editor crashes when I turn on pvrtc?

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:bust_in_silhouette: Asked By Pitanov V.V.

Why editor crashes when I turn on pvrtc?
I use texture 1024x1024. PNG format

There is no such problem on ETC2.
On PVRTC, the editor crashes without error.

project file:

config_version=4

[application]

config/name="TEST CRASH"
config/icon="res://icon.png"

[compression]

formats/zlib/compression_level=5
formats/gzip/compression_level=5

[rendering]

vram_compression/import_etc2=true
vram_compression/import_pvrtc=true
environment/default_environment="res://default_env.tres"

My OS: Win10 - 64
Godot version: 3.1.1-stable windows version

Texture:
My texture in project