Submitting a `General` Transaction (V5) renders some incorrectly decoded call details.

[pandres95]

When I submit a general transaction that includes non-standard transaction extensions (a runtime custom extension, not included in polkadot-sdk), the UI would render the call details incorrectly.

For example, in this case, the correct call was System::remark_with_event, but it's being rendered as System::set_heap_pages, even though we can clearly see the resulting events correspond to the first one (in this case System::Remarked).