date filter causes non-deterministic site build failure

[JorySchossau]

Bug Report

Environment

Linux: Solus OS
Linux: Ubuntu OS
Linux: WSL2

Zola version: 0.19.2

Expected Behavior

zola site should build every time deterministically, when using date filter in a template.

Current Behavior

No rust backtrace available.

Error: Reason: Failed to render 'listing.html'
Error: Reason: Filter call 'date' failed
Error: Reason: Filter `date` received an incorrect type for arg `value`: got `Null` but expected i64|u64|String
(build 0-6 times in a row of this error, then a build succeeds for some reason)

Step to reproduce

I have this in one of my templates, when removed the issue goes away.

<div class="post-date">{{ page.date | date(format="%B %d, %Y") }}</div>

Then try to build
zola build Maybe 1/3 the time the build succeeds okay. Usually the build fails. I just keep building until it succeeds. Not much of an issue on my local machine, but really puts a crimp in my automated git hook site deployment. I can write a for loop with max_retries around it...

[Keats]

I don't why the page.date would be null sometimes and why running it multiple times would work.
Does it say which page failed to render?