The problem of incomplete image cropping in subplot figure.

[liaoweiyang2017]

Because I want to use Chinese character in my figure, so I use the systemwide gmt, and the gmt version is v6.4.0. But the strange problem is that the figure has an incomplete image cropping. And it works well when I use the default artifact gmt v6.5.0, but in the v6.5.0 gmt I cannot input the Chinese characters correctly. Here is my demo code:

using GMT


gmtbegin("Figure1", fmt="png")
    subplot(grid="2x3", panels_size=(8,6), margins="10p") 
        
        basemap(
        par=(FONT_ANNOT_PRIMARY="8p,Helvetica,black", FONT_LABEL="10p,39,black"),
        region=[1e-2, 1e4, 1e2, 1e6], figsize=(-8, 6), proj=:logxy,
        xaxis=(annot=1, ticks=3, label=:"电阻率", scale=:pow), 
        yaxis=(annot=1, ticks=3, label=:"频率", scale=:pow),
        panel=(1, 1),
        )

        basemap!(
        par=(FONT_ANNOT_PRIMARY="8p,Helvetica,black", FONT_LABEL="10p,39,black"),
        region=[1e-2, 1e4, 1e2, 1e6], figsize=(-8, 6), proj=:logxy,
        xaxis=(annot=1, ticks=3, label=:"电阻率", scale=:pow), 
        yaxis=(annot=1, ticks=3, label=:"频率", scale=:pow),
        panel=(1, 2)
        )

        basemap!(
        par=(FONT_ANNOT_PRIMARY="8p,Helvetica,black", FONT_LABEL="10p,39,black"),
        region=[1e-2, 1e4, 1e2, 1e6], figsize=(-8, 6), proj=:logxy,
        xaxis=(annot=1, ticks=3, label=:"电阻率", scale=:pow), 
        yaxis=(annot=1, ticks=3, label=:"频率", scale=:pow),
        panel=(1, 3)
        )

        basemap!(
        par=(FONT_ANNOT_PRIMARY="8p,Helvetica,black", FONT_LABEL="10p,39,black"),
        region=[1e-2, 1e4, 1e2, 1e6], figsize=(-8, 6), proj=:logxy,
        xaxis=(annot=1, ticks=3, label=:"电阻率", scale=:pow), 
        yaxis=(annot=1, ticks=3, label=:"频率", scale=:pow),
        panel=(2, 1)
        )
       

    subplot()
gmtend()