dhl.de: breakage

### Prerequisites - [x] This is **NOT** a [_YouTube_](https://www.github.com/uBlockOrigin/uAssets/issues/30157), [_Facebook_](https://www.github.com/uBlockOrigin/uAssets/issues/3367), [_Twitch_](https://www.github.com/uBlockOrigin/uAssets/issues/5184), [_Spotify_](https://www.github.com/uBlockOrigin/uAssets/issues/22198) or [_a shortener/hosting site_](https://www.github.com/uBlockOrigin/uAssets/discussions/27472) report. _These sites MUST be reported by clicking their **respective links**_. - [x] I read and understand the [policy about what is a valid filter issue](https://github.com/uBlockOrigin/uAssets/blob/master/README.md#uassets). - [x] I verified that this issue is not a duplicate. (Use this [button](https://user-images.githubusercontent.com/585534/146582579-c32707a0-36a1-4cc5-ad50-83172c9f67a8.png) to find out.). **Comment in the old issue threads even when they are closed or even if you have a different problem.** - [x] I did not remove any of the [default filter lists](https://github.com/user-attachments/assets/1879fc88-09bc-4de4-9e2f-3834a6ab396a), or I have verified that the issue was not caused by removing any of the default lists. - [x] I did not enable additional or non-default filter lists, or I have identified which specific stock list is causing the issue. - [x] I do not have custom filters/rules, or I have verified that the issue still occurs without custom filters/rules. - [x] I have verified that the web browser's built-in content blocker/tracking protection, [network wide/DNS blocking](https://en.wikipedia.org/wiki/DNS_blocking), or my VPN is not causing the issue. - [x] I have turned off all other extensions and the issue still persists. (exception "[Firefox Multi-Account Containers](https://addons.mozilla.org/en-US/firefox/addon/multi-account-containers)"). - [x] If this is about a breakage or detection, I have verified that it is caused by uBlock Origin and isn't a site or browser issue. - [x] I have verified that the browser I am using is up to date with no pending updates. - [x] I did not answer truthfully to **ALL** the above checkboxes. ### URL(s) where the issue occurs. ```yaml https://www.dhl.de/keine-ps-zustellung ``` ### Description When filled out the form and sent it, it results in an error message. Without uBO (i.e. cookie filters) it works properly. ### Browser name and version Mozilla Firefox 140.13.0esr (64-Bit) ### Other extensions used n/a ### Country de-DE ### Screenshot(s) <img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/85f78734-5f0c-46fe-ace5-8f961cdc228d" /> ### Configuration <details> <summary>Details</summary> <!-- ⬇️ Paste the troubleshooting information here ⬇️ --> ```yaml uBlock Origin: 1.73.0 Firefox: 140 filterset (summary): network: 395191 cosmetic: 154055 scriptlet: 66685 html: 4067 listset (total-discarded, last-updated): added: adguard-generic: 99302-603, 2m adguard-mobile: 12653-74, 2m adguard-spyware-url: 2579-122, 2m block-lan: 91-0, 2m curben-phishing: 171948-46, 1h.29m ublock-cookies-adguard: 5825-36, 2m fanboy-cookiemonster: 47393-181, 2m ublock-cookies-easylist: 5825-5825, 2m ublock-annoyances: 4850-83, 28m Δ dpollock-0: 12955-355, 2m default: user-filters: 0-0, never ublock-filters: 53801-5071, 28m Δ ublock-badware: 10137-135, 28m Δ ublock-privacy: 4106-12, 28m Δ ublock-unbreak: 2860-91, 28m Δ ublock-quick-fixes: 529-68, 28m Δ easylist: 85342-1274, 28m Δ easyprivacy: 56210-140, 28m Δ urlhaus-1: 47560-11, 1h.29m plowe-0: 3526-1448, 2m DEU-0: 8426-58, 2m filterset (user): [empty] userSettings: contextMenuEnabled: false hiddenSettings: [none] supportStats: allReadyAfter: 470 ms (selfie) maxAssetCacheWait: 283 ms cacheBackend: indexedDB ``` </details>