The bug
When you place three rails as shown in the screenshot and you place at the bifurcation a redstone torch it will not update the rail, but when you place it under the rail it works.
[media]Example
Here is an example in video:
[media]Related issues
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Yup, this behaviour is indeed broken.
Putting two redstone torches adjecent to each other next to a junction will work. as will putting a redstone torch underneath the junction (as the bug report states).
FaRo1
Apparently you need to either power or depower an adjacient block for the rail junction to realise that it's being powered, but depowering the junction works instantly.
PR0CESS
This issue is actually not an issue in the rails, this is due to how Redstone torches update blocks 2 blocks away when placed, causing incorrect block update order.
theGlotzerify
can confirm in 1.18.1