languageserver::run() results in Error: stdin connection close on Windoes 10

languageserver::run() results in Error: stdin connection close on my Windows 10 machine

• Rtools has been installed
• The path to R (.../bin/x64) has been added as an environment variable
• Rtools has also been added to the environment variables

Any idea whatelse I could try?

The background is that I want to use the rlang server with LSP on Sublimetext.

Thank you for the help,
kind regards
Jana

The full error message in R reads:

[2020-08-22 13:27:30.597] Error: stdin connection close                                  
Call: stdin_read_line()                                                                  
Stack trace:                                                                             
1: stdin_read_line()                                                                     
2: self$read_line()                                                                      
3: self$read_header()                                                                    
4: self$fetch(blocking = FALSE)                                                          
[2020-08-22 13:27:30.618] exiting

Session Info
R version 3.6.3 (2020-02-29)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 18363)

Matrix products: default

locale:
[1] LC_COLLATE=German_Switzerland.1252 LC_CTYPE=German_Switzerland.1252
[3] LC_MONETARY=German_Switzerland.1252 LC_NUMERIC=C
[5] LC_TIME=German_Switzerland.1252

attached base packages:
[1] stats graphics grDevices utils datasets methods base

loaded via a namespace (and not attached):
[1] compiler_3.6.3 R6_2.4.1 parallel_3.6.3
[4] tools_3.6.3 collections_0.3.5 xml2_1.3.2
[7] languageserver_0.3.6

Start by reproducing languageserver::run() on Windows 10 with R 3.6.3 and languageserver 0.3.6, then trace the stdin_read_line(), self$read_line(), and self$read_header() calls shown in the stack trace. Done means identifying the cause of the stdin connection close and documenting or fixing the Windows setup or server behavior.