The following bits in the error message are completely irrelevant to diagnosing this issue in this context:
There is no data being accessed;
There is no other user deleting the data
What is the case is the following:
User has Run Flows permission (as Flow User, in Profile, or Permission Set)
The Flow is configured so as to override default behavior as ...
You have the following problems:
Do not wrap fields in double quotes
You concatenate strings using the & operator
You can add line breaks using the BR() function
Property__c.Site_Contact__c & BR() &
Property__c.Property_Group__r.Name & BR() &
Salesforce has recognised that as a known issue and currently there is no suggested workaround.
Interface validation is failing incorrectly on package install when a
lightning component that extends another lightning component which
implements the required quick action interfaces
(force:lightningQuickAction / force:lightningQuickActionWithoutHeader)
I would suggest one thing if you cannot achieve this by configuration.
Create a static Resource. Create a css file with this css (May change, you just need to inspect, but most likely to remain same, but inspect only for the timeline)
Create a Aura Component like this and just place call your CSS ...
Object-specific Send Email actions, available only on cases and you can use the case-specific Send Email action in Salesforce Classic, Lightning Experience, and Salesforce mobile app.
Unfortunately, Global Send Email actions are supported only in Lightning Experience.
Check Quick Actions
You can utilize your IDE (VS Code) to do this pretty quickly.
First, pull all your custom objects.
sfdx force:source:retrieve -m CustomObject
Next, you can search through the object-meta.xml files to find the relevant ActionOverride. If you're overriding a standard button with a lightning component, you'll find something like the following in the metadata ...