'Error expanding <image filename containing escaped {>'

[0ion9]

When lighthouse receives an item like this:

{%I/tmp/\{.png% \{=foo|\{=foo|+: \{=foo}

It complains Error expanding /tmp/{.png but nonetheless displays the image correctly.

The correct behaviour would be to not treat escaped { (or }?) as any kind of expansion.

FWIW, sending items with doubly-escaped { in image filename, like this:
{%I/tmp/\\{.png% \{=foo|\{=foo|+: \{=foo}
Does not improve things -- nothing gets displayed at all (no items are shown.).