Demolishing terminal foundation does not reliably demolish all attached terminal walls

Deleting the terminal foundations leaves behind random pieces of wall which cannot be deleted with either the normal bulldozer or terminal bulldozer...

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COLLECTED HARDWARE DATA
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Application version: Beta 4.1-1

Device
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Model: H97-HD3 (Gigabyte Technology Co., Ltd.)

Operating system: Windows 10 (10.0.0) 64bit

RAM size: 8 GB

Battery status: Charging
Battery level: -1

Processor device
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Type: Intel(R) Core(TM) i5-4590 CPU @ 3.30GHz
Core count: 4
Frequency: 3 GHz

Grahpics device
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Vendor: NVIDIA
Type: NVIDIA GeForce GTX 1050 Ti
Memory size: 4 GB

Screen summary
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Full screen: True
Resolution: 1920 x 1080 @ 60Hz