QR code of address does not show

[carnhofdaki]

Describe the bug

Half of the times the QR code for address tb1qchffkc20t82tk5akyhjn2524sh9kk24fyf495x (and many others, this is just an example) does not show.

Environment (please complete the following information):

See at bitcoinexplorer.org

Configuration file content

The configuration of bitcoinexplorer.org

To Reproduce

Steps to reproduce the behavior:

1. Go to https://signet.bitcoinexplorer.org/address/tb1qchffkc20t82tk5akyhjn2524sh9kk24fyf495x
2. If you can see the QR code, just refresh (CTRL+R) until it disappears
3. See missing QR code

Screenshots or Log Output

Inspecting the element, I see that the QR code does not show when the resulting HTML received by the browser contains

<div class="float-start float-md-end mb-3 mb-md-0">
<img alt="tb1qchffkc20t82tk5akyhjn2524sh9kk24fyf495x" style="border: 1px solid rgb(204, 204, 204); --darkreader-inline-border-top:#3e4446; --darkreader-inline-border-right:#3e4446; --darkreader-inline-border-bottom:#3e4446; --darkreader-inline-border-left:#3e4446;" data-darkreader-inline-border-top="" data-darkreader-inline-border-right="" data-darkreader-inline-border-bottom="" data-darkreader-inline-border-left="">
</div>

But after a (couple of) refresh the QR shows when the HTML contains this:

<div class="float-start float-md-end mb-3 mb-md-0">
<img src="data:image/png;base64,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" alt="tb1qchffkc20t82tk5akyhjn2524sh9kk24fyf495x" style="border: 1px solid rgb(204, 204, 204); --darkreader-inline-border-top:#3e4446; --darkreader-inline-border-right:#3e4446; --darkreader-inline-border-bottom:#3e4446; --darkreader-inline-border-left:#3e4446;" data-darkreader-inline-border-top="" data-darkreader-inline-border-right="" data-darkreader-inline-border-bottom="" data-darkreader-inline-border-left="">
</div>

After another couple of refreshes, the QR code again does not show. The broken image icon is shown inside the image bordered space and contains the address.

If applicable, add screenshots or log output to help explain your problem.

Screenshot when it's not showing:

Additional context

It behaves the same on mainnet bitcoinexplorer.org or be.anyone.eu.org (or for signet https://ex.signet.bublina.eu.org/)

Browser is a current version of Google Chrome.

[carnhofdaki]

And it's the same with DarkReader extension turned off:

Not working:

<div class="float-start float-md-end mb-3 mb-md-0">
<img alt="tb1qchffkc20t82tk5akyhjn2524sh9kk24fyf495x" style="border: solid 1px #ccc;">
</div>

Working (after refresh):

<div class="float-start float-md-end mb-3 mb-md-0">
<img src="data:image/png;base64,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" alt="tb1qchffkc20t82tk5akyhjn2524sh9kk24fyf495x" style="border: solid 1px #ccc;">
</div>

[carnhofdaki]

Another finding is that the QR code always shows for addresses which are known (by the queried Electrum server) to have been used:

• address tb1qlh279t5a0067n3sg6l56e4tq3yghy687c48tm9
• on bitcoinexplorer.org it is not showing any transactions and QR sometimes shows, sometimes not
• on ex.signet.bublina.eu.org the queried server knows about 12 transactions and so the QR code is always shown

[carnhofdaki]

So I guess it would be some race condition.

[carnhofdaki]

@janoside please have a look at this issue