Markup is not allowed in admonitions titles

[avivace]

E.g., I cannot do:

:::tip My title with some _italic_ words

Body of the admonition

:::

[ISSOtm]

I thought this would be a good thing, as the title is already somewhat stylized (so e.g. bold is redundant/invisible), and should be short enough that I don't think markup would be warranted.

I guess one possible exception is inline code?