我遇到了自定义环境的问题\listings：
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当我使用这个列表环境时：
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Ind_Cnj_VII_auto<-PV.Time + auto.ni.3.actor + auto.vii.3 + auto.vii.4 + Dem.actor + Pron.actor
Ind_Cnj_VAI_auto<-RdplW + PV.Time + PV.Move + PV.Qual + PV.StartFin + PV.Position + PV.Discourse + auto.vai.2 + auto.vai.5 + auto.vai.6 + auto.vai.12 + auto.vai.11 + auto.na.5.actor + auto.vai.9 + auto.vai.3 + auto.vai.4 + auto.vai.13 + auto.vai.8 + auto.vai.7 + auto.vai.10 + auto.na.3.actor + Sg.actor + Pron.actor + Pl.actor + Obv.actor + pn.1Pl.actor + actor.3 + actor.1 + actor.2 + actor.4
Ind_Cnj_VTI_auto<-RdplS + PV.Time + PV.Discourse + auto.vti.4 + auto.vti.2 + auto.na.5.actor + auto.ni.9.goal + auto.ni.2.goal + auto.ni.10.goal + Pron.actor + Pers.actor + pn.1Sg.actor + actor.3 + actor.1 + actor.2 + Sg.goal + Pl.goal
Ind_Cnj_VTA_auto<-PV.Time + PV.Move + PV.StartFinWantCan + PV.Discourse + PV.Position + auto.vta.6 + auto.vta.3 + auto.vta.5 + auto.vta.1 + auto.na.5.goal + auto.vta.4 + auto.nda.1.actor + auto.na.7.actor + auto.vta.7 + Sg.actor + D.actor + Px1Sg.actor + Obv.actor + actor.3 + actor.1 + actor.4 + goal.3 + goal.4 + goal.2 + Obv.goal + Px3Sg.goal
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当我使用上述关键字样式（例如actor.4）定义一些项目时，它们最终会变成黑色。
我正在使用 overleaf 与 pdflatex 和 TexLive 2020 进行编译。