scdoc strange rendering error - 2nd code block missing on 'back'

* run this:
	"PG_06d_Parallel_Patterns".help
* click to go to the page "Pattern Guide 06d: Parallel Patterns"
* scroll down to "The same, written using Pspawn"
* click on the link Pspawn
* click on the green back arrow

-> the code under "The same, written using Pspawn" is gone!

if i refresh the page comes back.

did anyone experience this before?
can anyone duplicate the problem?

i can reproduce it with other helpfiles so it's not a problem in the pattern guide above.
here's a reproducer...

instancemethods::

method::bus
test. click this link link::Classes/SinOsc:: and then come back with the back arrow.

code::
1+2;
::

second block (this code below will disappear)

code::
3+4;
::



(i'm on sc3.11.0 with macOS 10.12.6)
_f

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