Importing Heightmap to Landscape Crashes Editor

Importing a .png as a heightmap crashes the editor. No crash callstack is provided

Frequency: 2/7

Regression (yes) issue (does not) occur in 4.11.2

Crashreporter N/A

Note Attached are logs and a callstack provided by user from the last time the crash occurred for them.

1. Download attached .png file
2. Open Editor (any project)
3. Modes>Landscape Mode
4. Import from file
5. Select downloaded .PNG file
6. Press Create

Results

Editor freezes, then crashes with no crash report window.

Expected

Editor remains open, landscape heightmap is imported

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