GhostScript替换已嵌入字体问题及PDFA转换故障咨询

我对GhostScript的工作逻辑感到困惑：按认知GS仅替换未嵌入字体，不应改动已嵌入字体，但实际出现了替换情况。我的PDF包含2个已嵌入子集字体（注：osadzony podzestaw=embedded subset）和1个未嵌入字体（ArialMT）。

使用的命令如下：

"gswin64c.exe -I "C:/Program Files/gs/gs9.56.1/Resource/Init" -sFONTMAP="Fontmap.GS" -dNOSAFER -dPDFACompatibilityPolicy=1 -sColorConversionStrategy=LeaveColorUnchanged -dBATCH -dNOPAUSE -sDEVICE="pdfwrite" -dAutoRotatePages=/None -dPDFA=3 -sOutputFile="pdfa.pdf" "original.pdf"

执行命令后出现如下错误：

GPL Ghostscript 9.56.1: Actual TT subtable offset xxxxx differs from one in the TT header yyyy. (multiple ones like this)

The following errors were encountered at least once while processing this file:
        error executing PDF token

   **** This file had errors that were repaired or ignored.
   **** The file was produced by:
   **** >>>> StreamServe Communication Server 16.6.1 GA Build 319 (64 bit) <<<<
   **** Please notify the author of the software that produced this
   **** file that it does not conform to Adobe's published PDF
   **** specification.

最终输出的PDF文件不含任何字体。

现提出两个疑问：

• 是否有办法强制GS在未找到系统字体时不进行替换？
• 为何我已在FontMap.GS文件中指定ArialMT的具体路径，GS仍将其替换为NimbusSans-Regular？

注：因含敏感客户数据无法共享该PDF文件。

内容的提问来源于stack exchange，提问作者nvko