Math rendering: `{` and `}` require double escaping (`\\{` and `\\}`)

[mlondschien]

$$
S = \{ s: s \in S\}
$$

get's rendered as

$$ S = { s: s \in S} $$

(same for inline). The correct rendering is achieved with

$$
S = \\{ s: s \in S\\}
$$

resulting in

$$ S = \{ s: s \in S\} $$

[mlondschien]

Same for the negative space \!:

$$
\perp \!\!\! \perp
$$

get's rendered as

$$ \perp !!! \perp $$

(same for inline). The correct rendering is achieved with

$$
\perp \\!\\!\\! \perp
$$

resulting in

$$ \perp \!\!\! \perp $$

[yiyi-wang-rv]

Any solution for this? Thanks