Interesting issue. When I view one of the Cyrillic tabs, I see this in the Javascript console:
jquery.min.js:2 Uncaught Error: Syntax error, unrecognized expression: #section-%D1%81%D1%82%D1%80%D0%B0%D0%BD%D0%B8%D1%86%D0%B0-2
at Function.se.error (jquery.min.js:2)
at se.tokenize (jquery.min.js:2)
at se.select (jquery.min.js:2)
at Function.se [as find] (jquery.min.js:2)
at k.fn.init.find (jquery.min.js:2)
at new k.fn.init (jquery.min.js:2)
at k (jquery.min.js:2)
at c.show (:7:1078)
at HTMLAnchorElement. (:7:583)
at Function.each (jquery.min.js:2)
se.error @ jquery.min.js:2
se.tokenize @ jquery.min.js:2
se.select @ jquery.min.js:2
se @ jquery.min.js:2
find @ jquery.min.js:2
k.fn.init @ jquery.min.js:2
k @ jquery.min.js:2
c.show @ VM38:7
(anonymous) @ VM38:7
each @ jquery.min.js:2
each @ jquery.min.js:2
b @ VM38:7
e @ VM38:7
dispatch @ jquery.min.js:2
v.handle @ jquery.min.js:2
I don't know if it is the cause or a red-herring, but the version of jquery served from shinyapps.io is 3.4.1, while the version served when running the document from RStudio 1.2.5001 locally is 1.12.4.
Deploying myself doesn't seem to have reproduced either. Could you add the following to one of your tabs:
```{r}
sessionInfo()
```
I am curious what your deployed locale is such that your anchor link is "#section-страница-2" while mine is "#section-section-2".