az functionapp list returns incorrect null values

**Describe the bug**
When using the "az functionapp list" command the returned json contains values that should not be null, such as siteConfig.minTlsVersion
**To Reproduce**
Run a command along these lines:
az functionapp list --output json --query "[].{hostName:defaultHostName, httpsOnly:httpsOnly, minTlsVersion: siteConfig.minTlsVersion}" -o table
**Expected behavior**
The returned minTLSVersion should not be null.
**Environment summary**
Using the Azure Cloud Shell or a local bash client

**Additional context**
Using the Resource Explorer it can be confirmed that the values are not null and other commands, such as "az functionapp config show" return the correct values. It seems to be the "list" command that has the issue.