App Proxy Invalid signature

Shopify Partner
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Starting on July 7, 2023, we began observing random "Invalid signature" errors when validating app proxy signatures using the method described in the following documentation:

In these cases, the incoming signature differed from the expected signature only by the last character. For example:
Expected: ...d318
Received: ...d319

Prior to July 7, 2023, these errors did not occur. What could be causing this?

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