IE Mode stopped working on windows 7 using Edge Dev channel

After update to Edge Dev 78.0.276.2 IE Mode stopped working. Whenever I try to navigate to intranet site, I get error that internet explorer has crashed. After that intranet sites are opened in separate Internet explorer window. The same happens with current Edge Dev build 79.0.279.0. Edge Dev is installed using msi downloaded from enterprise section. I have policies "Configure Internet Explorer integration", "Configure Enterprise Mode Site List", "Send all intranet sites to Internet explorer" configured for IE Mode. 

Problem signature:
Problem Event Name: APPCRASH
Application Name: iexplore.exe
Application Version: 11.0.9600.19463
Application Timestamp: 5d648e95
Fault Module Name: IEFRAME.dll
Fault Module Version: 11.0.9600.19463
Fault Module Timestamp: 5d6496b7
Exception Code: c0000602
Exception Offset: 0000000000361e9a
OS Version: 6.1.7601.2.1.0.256.48
Locale ID: 1063
Additional Information 1: 7928
Additional Information 2: 7928abdb102dcb40bca60a1c932b6856
Additional Information 3: 8183
Additional Information 4: 8183fd5d4cf18c4cff0a191d3a86407d

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After error this is displayed on Edge Dev:

output from edge://version:

Microsoft Edge 79.0.279.0 (Official build) dev (64-bit)
Revision cac50b437460e1c0d876f57aa37f19c38fa0696f
Operating system Windows 7 Service Pack 1 (Build 7601.24519)
JavaScript V8 7.9.1
Flash 32.0.0.255 C:\Users\MindaugasS\AppData\Local\Microsoft\Edge Dev\User Data\PepperFlash\32.0.0.255\pepflashplayer.dll
User agent Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3907.0 Safari/537.36 Edg/79.0.279.0
Command-line "C:\Program Files (x86)\Microsoft\Edge Dev\Application\msedge.exe" --flag-switches-begin --flag-switches-end
Executable path C:\Program Files (x86)\Microsoft\Edge Dev\Application\msedge.exe
Profile path C:\Users\MindaugasS\AppData\Local\Microsoft\Edge Dev\User Data\Default