Not showing path with opacity (marker)

[ruha9005]

Example svg:

<svg>
    <path d="M200.5,436L200.5,437L200.5,439L202.5,440L203.5,442L206.5,445L210.5,448L215.5,453L222.5,458L230.5,464L241.5,473L250.5,480L265.5,490L281.5,501L294.5,510L312.5,523L327.5,533L342.5,543L360.5,555L377.5,566L394.5,578L411.5,590L425.5,598L442.5,610L460.5,622L470.5,629L485.5,639L497.5,647L509.5,655L518.5,661L530.5,668L538.5,673L545.5,677L551.5,680L556.5,684L561.5,686L565.5,689L568.5,691L571.5,693L573.5,694L575.5,695L577.5,697L578.5,698L579.5,698L580.5,699L581.5,699L581.5,699" fill="none" stroke="#FF0000" stroke-linecap="round" stroke-linejoin="round" stroke-opacity="1" stroke-width="30"/>
    <path d="M318.5,322L319.5,322L320.5,322L321.5,323L324.5,325L327.5,326L331.5,328L335.5,330L339.5,332L344.5,334L350.5,337L356.5,340L361.5,342L368.5,345L375.5,349L382.5,353L389.5,356L396.5,361L406.5,367L415.5,372L421.5,377L433.5,385L443.5,392L454.5,401L465.5,409L477.5,418L489.5,427L501.5,437L515.5,448L528.5,457L544.5,469L557.5,478L573.5,487L587.5,496L601.5,504L614.5,511L627.5,517L638.5,523L647.5,528L656.5,531L664.5,536L672.5,541L677.5,544L683.5,547L688.5,550L692.5,552L695.5,555L699.5,556L701.5,558L703.5,559L704.5,560L705.5,560L706.5,561L706.5,561" fill="none" opacity="0.5" stroke="#FF0000" stroke-linecap="round" stroke-linejoin="round" stroke-width="30"/>
</svg>

The first one is "pencil" and it displays correctly.
The second one is a "marker" (pencil with opacity) and is not displayed.