`build_from_derived()` produces unexpected results if unnecessary dataset is in `ds_list`

[kaz462]

below example is using spec from R/Pharma 2022 - Clinical Reporting In R workshop
adae predecessor variables are from ae and adsl (not dm) per spec, but if I add "dm" = dm in ds_list, the output contains two AESEQ columns AESEQ.x, AESEQ.y. would you help check? what do you think of adding warning messages if unnecessary dataset is in ds_list?

ae <- haven::read_xpt("datasets/SDTM/ae.xpt") %>% mutate(AESPROT = "")  # AESPROT not in ae.xpt, but needed for adae
dm <- haven::read_xpt("datasets/SDTM/ae.xpt") %>% mutate(AGE = "")
adsl <- haven::read_xpt("datasets/ADAM/adsl.xpt")

metacore <- spec_to_metacore("specs/specs.xlsx", where_sep_sheet = FALSE)
adae_spec <- metacore %>% select_dataset("ADAE")
adae_pred <- build_from_derived(adae_spec,
  ds_list = list(
    "ae" = ae,
    "dm" = dm,
    "adsl" = adsl
  )
)
names(adae_pred)

 [1] "STUDYID"  "USUBJID"  "AGE"      "AGEGR1"   "ACOUNTRY" "SEX"      "RACE"     "TRT01P"   "TRT01PN"  "TRT01A"  
[11] "TRT01AN"  "AESTDTC"  "AESEQ.x"  "AEENDTC"  "AEBODSYS" "AETERM"   "AEDECOD"  "AESPROT"  "AESEV"    "AEOUT"   
[21] "AESER"    "AESEQ.y"