Problem with Chinese characters

I'm not sure whether this is a bug for REditorSupport/vscode-R, R languageserver packages, or miss settings in vscode.

Description of Problem:

When I wrote an R program that included Chinese characters, the Chinese characters were automatically transformed into unicode.

before:

library(openxlsx)
read.xlsx("中文.xlsx")

after:

library(openxlsx)
read.xlsx("<U+4E2D><U+6587>.xlsx")

Environment (please complete the following information):

OS: Windwos 10
VSCode Version: 1.76.0
R Version: 4.1.3
vscode-R version: v2.7.2

Other Settings:

R>Lsp:Enabled
Enable the R language service to provide code analysis features completion,signature,hover,diagnostics,definition,etc.)

r$> sessionInfo()
R version 4.1.3 (2022-03-10)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19044)

Matrix products: default

locale:
[1] LC_COLLATE=Chinese (Simplified)_China.936
[2] LC_CTYPE=Chinese (Simplified)_China.936
[3] LC_MONETARY=Chinese (Simplified)_China.936
[4] LC_NUMERIC=C
[5] LC_TIME=Chinese (Simplified)_China.936

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

loaded via a namespace (and not attached):
[1] compiler_4.1.3 cli_3.6.0
[3] jsonlite_1.8.4 rlang_1.0.6

The issue names no repository files or tests. Start by reproducing the Windows 10 example with R 4.1.3 and the listed language-service setting, then determine whether vscode-R, the R language server, or VS Code transforms the Chinese characters. Done means identifying the responsible component and preserving the original characters in the saved R code.