flextable

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I'm using bookdown to make a PDF document via the xelatex engine and pandoc.

When merging a column, gaps appear in the left border of the first column:

library(flextable)
library(officer)

dt <- list(
         c("Raw Data",  "XML", "mzML", "Standard for raw MS data"),
         c("Raw Data",  "XML", "mzXML", "Open format for raw MS data"),
         c("Raw Data",  "HDF5", "mz5", "Open Binary format for raw MS data")
    )

data_types <- as.data.frame(t(as.data.frame(dt)))
rownames(data_types) <- c()

set_flextable_defaults(fonts_ignore = TRUE)

big_border = fp_border(color="Black", style = "solid", width = 1)
small_border = fp_border(color="gray", width = 1)

data_types %>%
    flextable() %>%
    set_table_properties(layout = "autofit", width = .8) %>%
    set_header_labels(V1="Data Type", V2="Syntax", V3="Format Name", V4="Usage") %>%
    merge_v(j = ~ V1) %>%
    border_remove() %>%
    valign(valign = "top", part = "all") %>%
    border_inner_h(part="all", border = small_border ) %>%
    border_inner_v(part="all", border = small_border) %>%
    border_outer(part="all", border = big_border ) %>%
    fix_border_issues(part = "all")
    
sessionInfo()
R version 4.2.1 (2022-06-23)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Monterey 12.5

Matrix products: default
LAPACK: /Library/Frameworks/R.framework/Versions/4.2/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

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

other attached packages:
[1] officer_0.4.3   flextable_0.7.2

loaded via a namespace (and not attached):
 [1] Rcpp_1.0.9        bookdown_0.27     digest_0.6.29     R6_2.5.1          evaluate_0.15     zip_2.2.0        
 [7] rlang_1.0.4       gdtools_0.2.4     cli_3.3.0         uuid_1.1-0        data.table_1.14.2 rstudioapi_0.13  
[13] xml2_1.3.3        rmarkdown_2.14    tools_4.2.1       xfun_0.31         yaml_2.3.5        fastmap_1.1.0    
[19] compiler_4.2.1    systemfonts_1.0.4 base64enc_0.1-3   htmltools_0.5.3   knitr_1.39